Gigantaxe(ギガントアクス, Giganto Akusu?), also known as Gigantic Axe, Gigant Axe, or Giant Axe, is a recurring weapon in the series. It is often a high-rank axe related to Giant equipment, sometimes being the strongest axe available in the game.

The Gigant Axe is the most powerful axe, and is only in the Advance remake. It provides +200 Attack, +25 Accuracy, +15 Strength, and has a chance of inflictingPoison upon hit. This weapon is metallic. It is found in the Lunar Ruins. The weapon is bugged in the North American and original Japanese releases, and never inflicts Poison on hit. The bug was fixed to the second Japanese release and the European port.

FFIVTAYGigant Axe is the most powerful axe, found only in the final floors of the Depths after defeating Iron Giant. It provides 150 Attack, 25% Accuracy, and +10 Strength, as well as inflicting Poison when attacking. It can only be wielded with both hands.

The Gigantaxe is the strongest axe available, and has the fifth strongest Attack of all weapons in its category. It can only be equipped by Clavats, and provides 109 attack at level 1 and 149 attack at level 30, as well as having two empty slots. It can be found in a chest in Forest (Hard or Very Hard mode), and then created for 1,130 gil by using Adaman Shell x5, Buffasaur Horn x1, and One-Eye Wing x5. When turned into a jewel, a level 3-9 Gigantaxe makes a Guard Stone 1, level 10-19 makes a Stamina Stone 3, and level 20-30 makes a Will Stone 5.